How Fixed-Rate Mortgages Work
A fixed-rate mortgage locks your interest rate for the entire loan term — 15, 20, or 30 years. Your principal and interest payment never changes, making budgeting predictable. In 2026, 30-year fixed rates average around 6.25-6.75%. The tradeoff: fixed rates are higher than initial ARM rates.
How Adjustable-Rate Mortgages Work
ARMs offer a lower fixed rate for an initial period (5, 7, or 10 years), then adjust annually based on a market index plus a margin. A 5/1 ARM might start at 5.5% versus 6.5% for a 30-year fixed. After the initial period, your rate could increase up to 2% per year, with a lifetime cap typically 5% above the start rate.
When Fixed Makes Sense
Choose fixed if: you plan to stay 10+ years, you want payment predictability, current rates are historically low, or you have a tight budget where rate increases would cause hardship. Fixed-rate mortgages are the safer, more conservative choice and are right for the majority of homebuyers.
When ARM Makes Sense
Choose an ARM if: you plan to move or refinance within 5-7 years, you want the lowest possible initial payment, you expect rates to stay stable or decline, or you can afford potential payment increases. ARMs saved borrowers who sold within 5-7 years an average of $10,000-30,000 compared to fixed rates.
ARM Caps and Protections
Modern ARMs have three caps: initial adjustment cap (typically 2%), periodic adjustment cap (2% per year), and lifetime cap (typically 5% over starting rate). A 5/1 ARM at 5.5% with 2/2/5 caps means your worst case is 7.5% at first adjustment, 9.5% at second, and 10.5% maximum ever.
The Hybrid Strategy
Some borrowers choose a 7/1 or 10/1 ARM as a middle ground — getting a lower rate than a 30-year fixed with more stability than a 5/1 ARM. Since the average homeowner stays just 7-8 years, a 7/1 ARM provides the initial fixed period most people actually need at a meaningfully lower rate.
Making Your Decision
Calculate total interest cost over your expected ownership period for each option. Factor in the worst-case ARM scenario. Consider your financial cushion for potential payment increases. If the ARM saves less than $15,000-20,000 over your expected stay, the predictability of a fixed rate may be worth the premium. Compare both options on MaboRates.
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